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fetch: allow passing a transaction to `s_update_ref()` 

The handling of ref updates is completely handled by `s_update_ref()`,
which will manage the complete lifecycle of the reference transaction.
This is fine right now given that git-fetch(1) does not support atomic
fetches, so each reference gets its own transaction. It is quite
inflexible though, as `s_update_ref()` only knows about a single
reference update at a time, so it doesn't allow us to alter the
strategy.

This commit prepares `s_update_ref()` and its only caller
`update_local_ref()` to allow passing an external transaction. If none
is given, then the existing behaviour is triggered which creates a new
transaction and directly commits it. Otherwise, if the caller provides a
transaction, then we only queue the update but don't commit it. This
optionally allows the caller to manage when a transaction will be
committed.

Given that `update_local_ref()` is always called with a `NULL`
transaction for now, no change in behaviour is expected from this
change.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2021-01-12 13:27:48 +01:00 committed by Junio C Hamano
parent c45889f104
commit d4c8db8f1b
1 changed files with 31 additions and 20 deletions
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51
builtin/fetch.c
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@ -583,11 +583,12 @@ static struct ref *get_ref_map(struct remote *remote,
static int s_update_ref(const char *action,
struct ref *ref,
struct ref_transaction *transaction,
int check_old)
{
char *msg;
char *rla = getenv("GIT_REFLOG_ACTION");
struct ref_transaction *transaction;
struct ref_transaction *our_transaction = NULL;
struct strbuf err = STRBUF_INIT;
int ret;
@ -597,10 +598,17 @@ static int s_update_ref(const char *action,
rla = default_rla.buf;
msg = xstrfmt("%s: %s", rla, action);
transaction = ref_transaction_begin(&err);
/*
* If no transaction was passed to us, we manage the transaction
* ourselves. Otherwise, we trust the caller to handle the transaction
* lifecycle.
*/
if (!transaction) {
ret = STORE_REF_ERROR_OTHER;
goto out;
transaction = our_transaction = ref_transaction_begin(&err);
if (!transaction) {
ret = STORE_REF_ERROR_OTHER;
goto out;
}
}
ret = ref_transaction_update(transaction, ref->name, &ref->new_oid,
@ -611,19 +619,21 @@ static int s_update_ref(const char *action,
goto out;
}
switch (ref_transaction_commit(transaction, &err)) {
case 0:
break;
case TRANSACTION_NAME_CONFLICT:
ret = STORE_REF_ERROR_DF_CONFLICT;
goto out;
default:
ret = STORE_REF_ERROR_OTHER;
goto out;
if (our_transaction) {
switch (ref_transaction_commit(our_transaction, &err)) {
case 0:
break;
case TRANSACTION_NAME_CONFLICT:
ret = STORE_REF_ERROR_DF_CONFLICT;
goto out;
default:
ret = STORE_REF_ERROR_OTHER;
goto out;
}
}
out:
ref_transaction_free(transaction);
ref_transaction_free(our_transaction);
if (ret)
error("%s", err.buf);
strbuf_release(&err);
@ -766,6 +776,7 @@ static void format_display(struct strbuf *display, char code,
}
static int update_local_ref(struct ref *ref,
struct ref_transaction *transaction,
const char *remote,
const struct ref *remote_ref,
struct strbuf *display,
@ -806,7 +817,7 @@ static int update_local_ref(struct ref *ref,
starts_with(ref->name, "refs/tags/")) {
if (force || ref->force) {
int r;
r = s_update_ref("updating tag", ref, 0);
r = s_update_ref("updating tag", ref, transaction, 0);
format_display(display, r ? '!' : 't', _("[tag update]"),
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@ -843,7 +854,7 @@ static int update_local_ref(struct ref *ref,
what = _("[new ref]");
}
r = s_update_ref(msg, ref, 0);
r = s_update_ref(msg, ref, transaction, 0);
format_display(display, r ? '!' : '*', what,
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@ -865,7 +876,7 @@ static int update_local_ref(struct ref *ref,
strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "..");
strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
r = s_update_ref("fast-forward", ref, 1);
r = s_update_ref("fast-forward", ref, transaction, 1);
format_display(display, r ? '!' : ' ', quickref.buf,
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@ -877,7 +888,7 @@ static int update_local_ref(struct ref *ref,
strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "...");
strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
r = s_update_ref("forced-update", ref, 1);
r = s_update_ref("forced-update", ref, transaction, 1);
format_display(display, r ? '!' : '+', quickref.buf,
r ? _("unable to update local ref") : _("forced update"),
remote, pretty_ref, summary_width);
@ -1094,8 +1105,8 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
strbuf_reset(&note);
if (ref) {
rc |= update_local_ref(ref, what, rm, &note,
summary_width);
rc |= update_local_ref(ref, NULL, what,
rm, &note, summary_width);
free(ref);
} else if (write_fetch_head || dry_run) {
/*